Participants:

K. Andre, Y. Dutheil, M. Hofer, A. Lechner, P. Martinek, S. Yue

Collider injection and machine protection (S. Yue):

• Investigations to rotate the phase space -> reduce horizontal emittance and increase vertical one
  • Maximum vertical emittance limited by aperture collimators
  • Kevin will investigate the potential influence of a large vertical emittance on the SR cone around the IPs (~0.37 nm)
• The injected beam can be split into 10 chunks
  •  This could reduce the maximum amount of beam deposited on injection protection device to 1%, which is the present limit considered
  •  This may be an issue with the present RF synchronization prospects between the booster and the collider, RF is looking into this
  •  Petr needs to study its possible influence on hardware design, such as power, cost.
  • Due to limited lifetime, the additional increase in injection time should be considered. The injected time for electron/positron is about 1 s, making up around 2.5% of total cycle time (~40s for Z)
  • The scheme of 10 injection has little influence on the average SR power, but it can reduce the SR peak power.
• Michael and Katsunobe are checking the ring beam dynamics with the injection section optics designed by Sen, ongoing optimisation
• There will be an optics meeting next week
  • Sen will present the injection scheme